Electric lamp



April 3, 1928.

H. A. DOUGLAS A ELECTRIC LAMP 'Il 'Il Il nl! Patented Apr.. 3, 1928.

UNITED STATES PATENT OFFICE.

ELEGTRIG Lerne.

Original application iled January 27, 1926, Serial No. 84,099..- Divided and this application iled i September 4, 1926i.

My invention, in accordance with one .of its characteristics, includes a light transmitting opening preferably in the side of the inner member that is in the iorm ot a shell that contains the lamp and through which openingr the lainp shines. This opening` is so positioned that it may be opened or closed according: to the relative longitudinal positions occupied by the members.

In accordance with another feature of the invention, a closure is provided for the lamp holding shell and a latch is employed` lor holding the closure in place. ln the preferred embodiment of the vinvention the closurel carries a push button for operating the latch.

The invention will be more fully explained inconnection with. the accompanying drawing'. in which Fig. 1 is a longitudinal sectional view ot' the preferred embodiment thereof; Fig. 2 is a view showing a part of the structure in side elevation and` a part of the structure in section and illustrating changed positions ot' some of the parts shown in Fig. l; Fig. is a view on line 3-3 of Fig. 1; Fig. 4 is a sectional view on line l1--4 of Fig. 2; Fig. 5 is a view similar to Fig'. 4. but showing changed positions ot' some of the parts; Fig. 6 `is a sectional View, on a larger scale, on lino 6,6 of Fig.- 2; and Fig. 7 is a view taken generally on line 7-7 of Fig. 1.

The deviceoi my invention is illustrated as being` adapted to a location upon the' dash board or mountingy panel 1.v The metallic cylindrical sleeve 2 is returned at its front end as indicated at 3, the rear end of the extension 3 heini; engageable with the front face of the dash board or panel that has an opening' f1' through which the central or un returned portion of the sleeve is passed. The sleeve threaded as indicated at 5 to receive a nut 6 which is screwed against the rear face of the panel 1 whereby the returned portion of the sleeve 3 is clamped against the panel to hold the sleeve in position. A metallic cylindrical shell 7 is surrounded by the sleeve 2 with which it is in telescopic engagement. This shell carries a detent in the form of a leaf spring 8` anchored at its inner end to the shell and having a lateral extension 9 normally in alignment with the serial 110.433.622.

sleeve and engagealole with the rear end of the sleeve to limitV the extent to Whichthe shell may project beyond the front end `of the sleeve. By depressing the detent, the shell may bewithdrawn througkhthe front end ot' the sleeve to permity thesleeve and shell to be separated. The shell carries latorally movable outwardly spring pressed plungers 10,. 11 and 12Which areengageable with the side o'l the sleeve to hold the shell in any ot the yvarious positions in which it may he placed along` the sleeve. Thekfront and projectingend ofthe shellA is desirably enlarged contain the incandescent lamp 13 Whose haseis provided with bayonet pins 14 receivable in the bayonet slots 15 formed in a socket 16 held in assembly with theshell by means of indented portions 17 upon the shell that enter openings 18 formed in the hase of the socket. y

The lamp illustrated is a single pole lamp whose base is surrounded by Aa metallic sheath connected with one terminal of the lamp lilament and grounded through the socket 16,. which is metallic,A and the suit ably grounded metallic shell 'l'. Thefreduced rear end of the shell containsa cylindrical plug of insulation 19 carrying a, metallic terminal 2l) in the form of a rod coaxial with and extending through the insulating plug. The rear end of thi-s rod has a cylindrical opening. to constitute a sockety formationin which the metallic circuit terminal plug 21 may he received. the union between the plug 21 and the terminal 20 loeingr thus' such that theplug'. 19, and the `parts assembled therewith may he turned Without twisting the Wire 22 leading to the plug Q1. The springs 23 and 24 which press' the plungei's l1 and 12 outwardly are contained Within spring barrels 25 and 26 which are screwed into the shell 7 and extendinto recesses formedqin the plug 19. Another recess 27.is provided to receive the free end of the latch of the detent 8 when this latch is depressed into the releasing position shown by dot and dash lines in Fig. 1.

The spring 28 which presses the plunger 10 outwardly is housedwithin a recess formed in the plug` 19. This spring bears at its outer end against the inner side of the shell B is receivedr Within an annular duced rear end 32 of the metallic spring barrel 33 which is secured to and within the front Vend of the plug 19 and which is aligned with the terminal rod 20. A spring 34 is located within the spring barrel 33 andpresses a metalliccontact plunger 35 forwardly into engagement with the rlamp terminal-contact 36 ycarried upon the rear face-ofthe base of the lamp. This contact 36 `is connected with the remaining terminal of the r lamp filament. rllhe spring 3a not only servesto establish contact between the plunger 35 and the lamp contact 36 but also serves toV hold ythe bayonet pins la in their seats within the 'bayonet slots 15. Vhen the spring 28 is-fully expanded it causes the metallic ring 30 to electrically connect the terminal rod 20 with the spring barrel 33 and as this spring barrel is in electrical connection with the contact plunger, circuit'is established when this spring is fully expanded. Y

When `the circuit ol the lamp is to be opened, the shellis moved rearwardly until the plunger 10 is received in the annular space 37. Thisspace is olf smaller diameter than the diameter ot the forward portion ot the sleeve 2 so that the plunger 10 is depressed, when received in the space 37, against the force ci' the spring 28 to separate the ring 30 'from its compleinent'al contacting portions 31 and When the lamp is thus in open circuit, the plunger 10 also serves to hold the shell in its circuit opening position. When the circuit is closed,

Vthe plunger 10 jdesirably has no contact with -the sleeve 2 in order that the spring 28 may forcibly press the ring 30 against its complemental contacts 31 and 32. Jit ythis time, the. plungers 11 and ,12 serve to hold the shell in its adjusted position within the sleeve. The shell is termed with` a light transmitting opening `38 'in its side, this to shine therethrough.

`adjusted rearwardly to vary the position oi opening being positioned to permit thc lamp The vshell may be the lamp iand the opening 38 with relation to the dash board l so that the location of shifted.

the light emanating from the lamp may be The plungers 11 and 12 are also receivable in the annular space v37. These plungers are located at diderent positions along the plug 19 so that the shell may be kheld in diierent positions with the light transmitting opening .88 in front of the panel land the returned portion 3 `ot the sleeve 2. The shellV may be further moved Lenscare of a cap 39 having a rearwardly extending shirt which surrounds the front end of the shell. 'two latches are carried by the closure cap, each latch being desirably in the i'orni or a spring bar 40. These bars are desirably termed in one piece and are assem bled with `the shank of the outwardly spring pressed push button al housed within a spring barrel e2 which passes through and is assembled with the handle portion 43 and which is also assembled with the closure cap The latch bars et() are laterally extended at their rear ends, these extensions being desirably in the form of lu heads 44. The skirt ot the closure capf39 and the forward end or the shell 7 are provided with registrable openings 39 and 7 which receive the headed ertensions All, these T headed extensions thus serving to latch the ,shell and cap together. l/Vhen the push button is pressed inwardly, .the reduced portions of the bars Ll() adjacent the extensions la are received in the openings 7 and the T' headed extensions are ejected from these openings, l

Vis assembled with the shell 7, the handle 4:3

may be employed to eti'ect various adjustments of the shell 7 longitudinally of the sleeve 2.- vFeatures not herein claimed form Vthesubject matter of my original application 8%,099, tiled January 27, 1926 of which the present application is a division.

Changes may be made without departing Vfrom the invention.

lHaving thus described my invention, I claim:

1; rlhe combination with a shell; of a lamp within the shell; a closure for one end et the shell; and a latch carried by said closure and in the form of a bar having a klateral extension movable into registrable openings formed in the closure and shell lto latch the closure and shell together, the

opening in the shell havingV a reduced continuation in thei'orm of an open ended slot in which the portion of the bar adjacent the lateral extension of the bar is receivable and is passed to release the latch.

2..l`he combination with a shell; of a lamp within the shell; a closure for one end of the shell; a latch carried by said closure and in the form of a bar having a lateral extension movable into registrable yopenings to release the latch; and a ush button ozu*-V orlned in the closure and shell to latch the red by the closure for adyusting the latch closure and shell together, the opening in to releasing position, the latch being self 10 the shell having a reduced continuation in adjustable to holding position.

5 the Yforni of an open ended slot in which the In witnese` whereof, I hereunto subscribe portion of the bai' adjacent the lateral exmy naine. tension of the bei' is receivable and is passed HARRY A. DOUGLAS. 

